The concentration of insulin can vary depending on the specific formulation and manufacturer. However, a commonly used concentration for insulin is U-100, which means there are 100 units of insulin per 1 milliliter (mL) of solution.
Therefore, in 1 mL of insulin with a U-100 concentration, there are 100 units of insulin. It's important to note that this concentration may differ for different insulin preparations, so it's always crucial to check the specific concentration indicated on the insulin packaging or consult with a healthcare professional for accurate dosing instructions.